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Image from page 227 of “The Bell System technical journal” (1922)

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Identifier: bellsystemtechni16amerrich
Title: The Bell System technical journal
Year: 1922 (1920s)
Authors: American Telephone and Telegraph Company
Subjects: Telecommunication Electric engineering Communication Electronics Science Technology
Publisher: [Short Hills, N.J., etc., American Telephone and Telegraph Co.]
Contributing Library: Prelinger Library
Digitizing Sponsor: Internet Archive

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Text Appearing Before Image:
sed in each test (Fig. 10). Lentinuslepideus, cited by Buller,^ Snell ^ and Humphrey ^ and isolated severaltimes from posts in the Gulf port, Mississippi, test plot,^ as well asfrom poles in service, is used in all cases of organic preservatives, butis seldom used against metallic salts, to which it is extremely sensitive.Lenzites trabea, another species of great economic importance, Hubert,*and also isolated several times from rotted southern pine poles, issomewhat parallel in resistance to Lentinus lepideus, but produces amarkedly different type of decay. Polyporus vaporarius, Porta in-crassata, and Coniophora cerebella, the common dry rots, althougheasily killed by many hydrocarbons, are resistant to most inorganiccompounds, and at least one of these organisms is included in eachtest on such materials. Fomes roseus, another fungus of wide dis-tribution, reacts in a most inconsistent manner, but its occasionalspecific virulence is sufficient to warrant its inclusion in all assays of

Text Appearing After Image:
Fig. 10.^—Assay of worthless preservative at maximum concentration. Thefungi in dupUcate from left to right are Lenzites trabea, U-10, Fomes roseus aiulLeniinns lepideus. new and unusual preservatives. Unfortunately the fastest and mostversatile decay organism used has no name and masquerades underthe designation U (unknown)-lO. Isolated several years ago from adecayed pine pole, the identity of U-10 is still a mystery, despite theefforts of many mycological authorities. U-10 is included in everytest and is especially valuable when a quick indication of the value ofa new preservative is needed, as it is capable of producing an appreci-able weight loss in about three months. In addition to the abovefungi occasional use is made of such common wood-destroyers asTrametes serialis, Lenzites sepiaria, Polystictus versicolor, Polyporussulphureus, and Fomes pinicola. At the present stage of development this wood block method tellsnothing directly about the ability of a wood preservative to

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